<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>1_字符串形式的ref</title>
  </head>
  <body>
    <!-- 准备好一个“容器” -->
    <div id="test"></div>

    <!-- 引入react核心库 -->
    <script type="text/javascript" src="../js/react.development.js"></script>
    <!-- 引入react-dom，用于支持react操作DOM -->
    <script
      type="text/javascript"
      src="../js/react-dom.development.js"
    ></script>
    <!-- 引入babel，用于将jsx转为js -->
    <script type="text/javascript" src="../js/babel.min.js"></script>

    <script type="text/babel">
      //创建组件
      class Demo extends React.Component {
        //展示左侧输入框的数据
        showData = () => {
          // 这里的this指向调用它的节点
          const { input1 } = this
          // console.log(this)
          alert(input1.value)
        }
        //展示右侧输入框的数据
        showData2 = () => {
          const { input2 } = this
          alert(input2.value)
        }
        // 箭头函数简写形式
        render() {
          return (
            <div>
              <input
                ref={(currentNode) => (this.input1 = currentNode)}
                type="text"
                placeholder="点击按钮提示数据"
              />
              &nbsp;
              <button onClick={this.showData}>点我提示左侧的数据</button>&nbsp;
              <input
                onBlur={this.showData2}
                ref={(c) => (this.input2 = c)}
                type="text"
                placeholder="失去焦点提示数据"
              />
              &nbsp;
            </div>
          )
        }
      }
      //渲染组件到页面
      ReactDOM.render(<Demo a="1" b="2" />, document.getElementById('test'))
    </script>
  </body>
</html>
